Make quetz compatible with SQLAlchemy 2.0

[simonbohnen]

Closes #587.

[codecov-commenter]

Codecov Report

Base: 82.53% // Head: 81.57% // Decreases project coverage by -0.96% ⚠️

Coverage data is based on head (56ff8d5) compared to base (e76b001).
Patch coverage: 87.50% of modified lines in pull request are covered.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #598      +/-   ##
==========================================
- Coverage   82.53%   81.57%   -0.96%     
==========================================
  Files          78       78              
  Lines        6062     6068       +6     
==========================================
- Hits         5003     4950      -53     
- Misses       1059     1118      +59     

Impacted Files	Coverage Δ
quetz/db_models.py	95.78% <75.00%> (-1.12%)	⬇️
quetz/dao.py	89.16% <100.00%> (ø)
quetz/migrations/env.py	69.44% <100.00%> (ø)
quetz/pkgstores.py	42.45% <0.00%> (-11.60%)	⬇️
quetz/tasks/mirror.py	89.43% <0.00%> (-1.06%)	⬇️
quetz/main.py	86.38% <0.00%> (-0.13%)	⬇️

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[wolfv]

wow. nice!

[janjagusch]

@simonbohnen, should we go ahead and merge this?

[simonbohnen]

@simonbohnen, should we go ahead and merge this?

Yes please! 😁